I'm not a CFP, but I did stay at a Holiday Inn Express last night.
Just kidding, but it sounds like a great plan, mate! I did some online searching to see if New York tries to recapture the deduction on the other side, but have found that everything looks solid. If you have already earmarked the cash, definitely push it into a 529 on both sides of the calendar.
I just finished a financial planning class, and our professor told us that because you get this state tax deduction, tax-free growth, and tax-free withdrawal that it's one of the best investment vehicles available.
A Health Savings Account is the top dog because most states give a tax deduction AND you get a federal deduction along with the tax-free growth and tax-free withdrawal, but that won't help you pay for Wharton : P